added extra potions

src/potions/continuous_restoration.h

@@ -0,0 +1,17 @@
+#ifndef __CONTINUOUS_RESTORATION_H__
+#define __CONTINUOUS_RESTORATION_H__
+
+#include "../potion.h"
+
+class continuous_restoration final: public potion {
+        static const int GAIN_HEALTH = 3;
+        static const int DURATION = 5;
+public:
+        continuous_restoration(const position &pos);
+        void apply(const enum race &race, int &HP, int &ATK, int &DEF,
+                   fraction &base_hit_rate) override;
+        int get_priority() const override;
+        const char *get_name() const override;
+};
+
+#endif